High-adhesion, high-water-resistance, light-weight, environment-friendly soundproof coating and preparation method thereof

Abstract

The application provides a high-adhesion, high-water-resistance, light, environment-friendly and sound-insulating coating and a preparation method thereof, and the coating composition comprises organic silicon modified acrylic emulsion, hollow glass microbeads, aerogel dispersion slurry, modified bentonite, expanded perlite, wood fiber, hydroxyethyl cellulose, additives and water; the modified bentonite is obtained by grafting acrylic ester on bentonite, grafting hollow glass microbeads on a silane coupling agent and grafting wood fiber on tung oil, and the organic silicon modified acrylic emulsion is obtained by reacting organic silicon alkoxane, organic silicon coupling agent and acrylic ester. The high-adhesion, high-water-resistance, light, environment-friendly and sound-insulating coating of the application is added with modified bentonite, the compatibility of various components is enhanced, and thus the adhesion, water resistance, sound insulation and other performances of the coating are improved, the coating is light and environment-friendly, and has a good application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, and mainly relates to a light-weight environment-friendly sound insulation coating with high adhesion and high water resistance and a preparation method thereof. BACKGROUND

[0002] At present, with the improvement of people's quality of life, residential comfort as an important indicator of quality of life has attracted more and more attention. Noise not only affects the rest, study and work of residents, but also may damage hearing health and even cause diseases. There are two ways of noise transmission in residential buildings, one is air transmission, such as voice, telephone, musical instrument playing, etc.; the other is solid transmission, such as noise caused by floor vibration due to personnel walking and moving furniture. Research data on housing noise shows that the main source of noise is the impact sound of building floors, such as footsteps, heavy objects falling, children running and jumping, etc. Sound insulation pads, rock wool, sound insulation mortar and sound insulation coatings can reduce the impact sound of building floors, but sound insulation pads are flammable and prone to hollowing after paving; rock wool is currently limited in use due to its carcinogenicity; sound insulation mortar has a large application thickness, generally 30mm, which will greatly reduce the indoor space; therefore, sound insulation coatings are more suitable for application in building floor impact sound insulation.

[0003] At present, various types of sound insulation coating products are in the development stage, and the quality is uneven. Common sound insulation coating raw materials include rubber, vermiculite, isocyanate resin, fiber cotton and white sand, etc. However, rubber and isocyanate synthetic resin are not green and environmentally friendly; white sand has a large specific gravity, which will increase the load on the coating; vermiculite has low strength and is prone to cracking; fiber cotton has poor water resistance, and the adhesion strength is ignored to achieve good sound insulation effect, which is not suitable for large-area popularization and application.

[0004] In addition, the existing sound insulation coating products are prone to cracking or even falling off due to insufficient adhesion when thickly coated; the sound insulation coating has poor water resistance and is prone to discoloration, cracking and falling off when in contact with water for a long time; the sound insulation coating has a long drying time after application, which affects the construction efficiency; the sound insulation coating has poor state and is prone to delamination, which indirectly affects the construction performance; the sound insulation effect of the sound insulation coating is generally not satisfactory; the viscosity strength and sound insulation effect of the sound insulation coating cannot achieve an ideal balance, and in order to achieve a sound insulation effect meeting the national standard, the adhesion strength is generally small, which greatly affects the application.

[0005] In view of the above, it is necessary to develop a new technical scheme to solve the defects and deficiencies in the prior art. SUMMARY

[0006] The application provides a high-adhesion, high-water-resistance, light, environment-friendly and sound-insulating coating, which is prepared from an organic silicon modified acrylic emulsion as a film forming material, and is combined with aerogel dispersion slurry, hollow glass microbeads, expanded perlite and wood fiber as sound-insulating fillers, and further combined with modified bentonite to increase the compatibility of the components, improve the adhesion, water resistance and sound-insulating effect of the coating, and has the characteristics of lightness and environmental friendliness, and has a good application prospect.

[0007] One object of the application is to provide a high-adhesion, high-water-resistance, light, environment-friendly and sound-insulating coating.

[0008]

[0009] The modified bentonite is obtained by reaction of acrylic ester grafted bentonite, hollow glass microbead grafted silane coupling agent and wood fiber grafted tung oil acid.

[0010] The organic silicon modified acrylic emulsion is obtained by reaction of organic siloxane, organic silicon coupling agent and acrylic ester.

[0011] Further, the organic silicon modified acrylic emulsion is a silicone-acrylate emulsion with an organic silicon content of 30-40%, which has good adhesion and can be firmly attached to the surface of a substrate, excellent water resistance and can effectively prevent water penetration, flexibility and anti-cracking properties, and can protect the coating from cracking even when thickly coated, thereby improving the durability of the coating.

[0012] Further, the aerogel dispersion slurry is a paste-like silica aerogel material prepared by dispersing aerogel powder in water, which has excellent hydrophobic properties and ultra-low density, with a density of 0.4-0.5 g / cm 3 , high solid content of about 30%, is environment-friendly and dust-free, and can impart lightness and sound-insulating properties to the material.

[0013] Further, the particle size of the expanded perlite is 2-4 mm.

[0014] Further, the expanded perlite is a closed-cell expanded perlite, which has high flexibility and anti-cracking properties, is light and has low specific gravity, is beneficial to improve workability, and has good heat and sound insulation properties.

[0015] Further, the particle size of the hollow glass microbead is 50-150 μm.

[0016] Further, the hollow glass microbead is an alkali lime borosilicate white micron-sized smooth-surfaced hollow spherical glass light powder material, which has good fluidity and sound-insulating and noise-reducing properties.

[0017] Further, the wood fiber is an organic flocculent fiber material with small specific gravity, excellent sound and heat insulation performance, and can prevent coating cracking and enhance the adhesion of the coating surface.

[0018] Further, the modified bentonite has excellent breathability and atomization effect, can adjust the drying speed of the sound insulation coating, and has excellent anti-sagging and anti-suspending performance, which is beneficial to improve the workability and storage property.

[0019] Further, the auxiliary agent is selected from one or more of a dispersing agent, a wetting agent, a mineral oil defoaming agent, a film-forming auxiliary agent, a pH regulator, a polyurethane thickening agent, a silicone defoaming agent, a freeze-thaw wetting agent, and a preservative.

[0020] Further, the dispersing agent has super strong dispersing ability, excellent stability and water resistance.

[0021] Further, the dispersing agent is selected from ROSF-1023 of Rose Technology Co., Ltd.

[0022] Further, the wetting agent is selected from BD-109 of Dow Chemical.

[0023] Further, the mineral oil defoaming agent is selected from DF-1390 of Puwei (Shanghai) New Material Technology Co., Ltd.

[0024] Further, the film-forming auxiliary agent is selected from alcohol ester twelve of Eastman.

[0025] Further, the pH regulator is selected from one or more of 2-butyl amino ethanol and 2-amino-2-methyl-1-propanol.

[0026] Further, the polyurethane thickening agent is selected from a water-based non-ionic associated hydrophobic modified polyurethane.

[0027] Further, the polyurethane thickening agent has excellent phase solubility, thickening and leveling properties, and water and alkali resistance.

[0028] Further, the silicone defoaming agent is selected from 2410AC of BASF Chemical.

[0029] Further, the freeze-thaw wetting agent has excellent anti-freeze-thaw property, good environmental performance and chemical stability.

[0030] Further, the freeze-thaw wetting agent is selected from PEG300 of Malaysia Petroleum Company.

[0031] Further, the preservative is selected from one or two of benzisothiazolinone, iodo propargyl n-butyl aminocarbamate, or methyl isothiazolinone.

[0032] Another object of the present application is to provide a preparation method of the high-adhesion high-water-resistance lightweight environmentally-friendly soundproof coating.

[0033] S1, add an emulsifier to a container, drop organic siloxane and organic silicon coupling agent, heat and react at 70-90 DEG C, then drop acrylate and continue to react to obtain an organic silicon modified acrylate emulsion;

[0034] S2, blend and stir a dispersant, a wetting agent, a pH regulator, and silica aerogel powder, add a defoaming agent and stir to obtain an aerogel dispersion slurry;

[0035] S3, blend bentonite and acrylate, heat and react at 190-210 DEG C to obtain acrylate grafted bentonite; blend hollow glass microspheres and silane coupling agent, heat and react at 55-65 DEG C to obtain silane coupling agent grafted hollow glass microspheres; blend wood fiber and tung oil, heat and react at 50-100 DEG C to obtain tung oil grafted wood fiber;

[0036] S4, blend and heat and react acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, and tung oil grafted wood fiber under an inert atmosphere to obtain modified bentonite;

[0037] S5, blend and stir the organic silicon modified acrylate emulsion, the aerogel dispersion slurry, and the modified bentonite with other components to obtain the high-adhesion high-water-resistance lightweight environmentally-friendly soundproof coating.

[0038] Further, in step S1, the mass ratio of the organic siloxane, the organic silicon coupling agent, and the acrylate is (20-40):(2-7):(1-5).

[0039] Further, in step S2, the mass ratio of the dispersant, the wetting agent, the pH regulator, the aerogel powder, and the defoaming agent is 3:2:0.5:(30-40):(1-5).

[0040] Further, in step S3, the mass ratio of the bentonite and the acrylate is 1:(45-55); the mass ratio of the hollow glass microspheres and the silane coupling agent is 1:(0.2-0.4); and the amount of the tung oil is 1-5 times the amount of the active hydroxyl substance of the wood fiber.

[0041] Further, in step S4, the mass ratio of the acrylate grafted bentonite, the silane coupling agent grafted hollow glass microspheres, and the tung oil grafted wood fiber is (1-3):(1-3):(1-3).

[0042] The present application has the following beneficial effects:

[0043] The high-adhesion high-water-resistance light environment-friendly sound insulation coating provided by the present application adds modified bentonite, which has certain thickening effect, replaces the existing product thickening by adding hydroxyethyl cellulose, and can improve the drying speed, water resistance, storage property and workability of the sound insulation coating, and the water resistance of the sound insulation coating is further improved by adding polyurethane thickening agent, which has synergistic effect with the modified bentonite, solves the problems of poor storage property, slow drying after application, poor work experience and further improves the water resistance and durability of the coating.

[0044] The present application also adds organic silicon modified acrylic emulsion as the main film-forming material, and the emulsion has the characteristics of high organic silicon modification amount, and the organic silicon content reaches 30-40%, which can significantly improve the water resistance and bonding strength of the emulsion, enhance the water resistance and bonding strength of the coating film, and firmly adhere the sound insulation coating to the surface of the substrate, and the modified emulsion also has excellent flexibility and crack resistance, which can prevent the thick coating from cracking, and effectively solve the problems of easy cracking, poor bonding strength and water resistance of the existing products.

[0045] The present application also uses silica aerogel, expanded perlite, hollow glass microspheres and wood fiber as sound insulation fillers, which endow the coating with the characteristics of light weight, environmental protection and excellent sound insulation effect. The wood fiber not only has the characteristics of preventing the coating from cracking, but also has synergistic effect with the organic silicon modified acrylic emulsion, which further improves the thick coating crack resistance and durability of the coating. At the same time, through the preferred process, the silica aerogel is first prepared into a silica aerogel dispersion slurry with a solid content of 30% by high-speed stirring method, and then added into the finished product for dispersion, which solves the problem of poor dispersion of silica aerogel.

[0046] In addition, the light environment-friendly sound insulation coating of the present application also adds special freeze-thaw wetting agent, so it does not need to add any alcohol ether type auxiliary agent to provide anti-freezing effect, which not only makes the product have smaller odor, lower VOC and better environmental protection, but also further accelerates the drying speed of the thick coating, and solves the existing technical problems. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 The preparation principle of the coating of Example 1 is shown, wherein the sound insulation fillers include silica aerogel, expanded perlite, hollow glass microspheres and wood fiber. DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the technical solutions of the present application, the following examples are listed. The raw materials, reactions and post-processing methods appearing in the examples are all common raw materials on the market and technical means well known to those skilled in the art, unless otherwise stated.

[0049] The words "preferred", "preferably", "more preferred", and the like in the present specification are intended to mean embodiments of the application that can provide certain benefits under certain circumstances. However, other embodiments can also be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude those other embodiments from the scope of the application.

[0050] It should be understood that, except in any operating examples, or otherwise indicated herein, and that the use of amounts or all numbers expressing quantities of ingredients, reaction or other conditions in the specification and claims are by way of approximation. Thus, the numerical parameters set forth in the following specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present application.

[0051] The following raw materials are used in the embodiments of the present application:

[0052] Dodecylbenzenesulfonic acid, emulsifier, purchased from Zhejiang Mingxiang Organic Additives Co., Ltd.;

[0053] Octamethylcyclotetrasiloxane, organosiloxane monomer, purchased from Zhejiang Mingxiang Organic Additives Co., Ltd.;

[0054] Gamma-methacryloxypropyltrimethoxysilane, organosilicon coupling monomer, purchased from Zhejiang Mingxiang Organic Additives Co., Ltd.;

[0055] Methyl methacrylate, acrylate monomer, purchased from Zhejiang Mingxiang Organic Additives Co., Ltd.;

[0056] AMP-95, pH adjuster;

[0057] P30, dispersant, purchased from France Goetay Co., Ltd.;

[0058] LCN070, wetting agent, purchased from Clariant Chemicals Co., Ltd.;

[0059] KNF-W20-H, hydrophobic aerogel powder, purchased from Anhui Keang Co., Ltd.;

[0060] Expanded perlite, particle size 2-4 mm;

[0061] Hollow glass microbeads, particle size 50-150 μm;

[0062] RM-8W, polyurethane thickener, available from Dow Chemical Company;

[0063] 2410AC, silicone defoamer, available from BASF Chemical Company;

[0064] DF-1390, mineral oil defoamer, available from Puwei (Shanghai) New Material Technology Co., Ltd.;

[0065] PEG 300, freeze-thaw wetting agent, available from Malaysia Petroleum Company;

[0066] MBS5050, preservative, available from Thor Chemical Group Company;

[0067] Wood fiber, available from Rödmetall GmbH.

[0068] Example 1

[0069] A high-adhesion, high-water-resistance, lightweight, environmentally friendly soundproof coating, comprising the following components in mass fraction:

[0070]

[0071] The preparation method of the high-adhesion, high-water-resistance, lightweight, environmentally friendly soundproof coating comprises the following steps:

[0072] S1, dissolve 3.2 parts of dodecyl benzene sulfonic acid in 50 parts of deionized water, then transfer to a four-necked flask with a mechanical stirrer and a condenser, heat to 80℃ under continuous stirring, add 35 parts of octamethylcyclotetrasiloxane and 5 parts of γ-methacryloxypropyltrimethoxysilane dropwise within 1 hour, react for 12 hours, cool to 40℃, adjust the pH value to 7-8 with 0.5 parts of AMP-95, heat to 80℃, add 1.2 parts of methyl methacrylate and 0.3 parts of ammonium persulfate dropwise within 2 hours, incubate for 4 hours, cool to room temperature, adjust the pH value with 0.5 parts of AMP-95, filter, discharge, and obtain the silicone-modified acrylic emulsion;

[0073] S2, add 64 parts of water to a stirring container, slowly add 3 parts of P30, 2 parts of LCN070 and 0.5 parts of AMP-95 under low-speed stirring, stir until evenly dispersed and fully dissolved in water; slowly add 30 parts of KNF-W20-H, increase the stirring speed to 1200-1500 revolutions per minute, and high-speed stir for 20 minutes to ensure that the KNF-W20-H is fully dispersed; finally, add 3 parts of 2410AC, and medium-speed stir until evenly dispersed, to obtain the aerogel dispersion slurry;

[0074] S3, bentonite, potassium persulfate, propyl acrylate and solvent ethanol are mixed (the mass ratio of bentonite, potassium persulfate, propyl acrylate, solvent is 1:1.5:50:70) to obtain a suspension solution, then deionized water with the same mass as the suspension solution is added, heated to 200°C and stirred for 0.5h, the suspension solution is uniformly dispersed, and then heated and reacted for 5h, filtered, and dried in an oven at 90°C for 3h to obtain propyl acrylate grafted bentonite; hollow glass microspheres and kh570 are added to an ethanol aqueous solution with a mass fraction of 90% (the mass ratio of hollow glass microspheres, kh570, ethanol is 1:0.2:20), ultrasonic dispersion is carried out at 60°C for 1h, then suction filtration, drying, grinding and sieving are carried out to obtain silane coupling agent grafted hollow glass microspheres; wood fibers, anhydrous pyridine, and 2 molar parts of tung oil acid chloride are blended, a catalyst N,N-dimethylaminopyridine is added (the mass ratio of wood fibers, anhydrous pyridine, N,N-dimethylaminopyridine is 1:30:0.05), heated to 50°C and reacted for 6h, then 50% ethanol aqueous solution is added (the mass ratio of wood fibers, ethanol is 1:20) and stirred for 30min, suction filtered, washed with a small amount of ethanol three times, then washed once with acetone, extracted with acetone in a Soxhlet extractor for 16h, and dried in an oven at 60°C for 24h to obtain tung oil acid grafted wood fibers;

[0075] S4, under a nitrogen environment, sodium ethylenediamine sulfonate, propyl acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, and tung oil acid grafted wood fibers are added to deionized water (the mass ratio of sodium ethylenediamine sulfonate, propyl acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, tung oil acid grafted wood fibers, deionized water is 0.2:1:1:1:10) and stirred for 15min, heated to 80°C, and then ammonium persulfate is added dropwise (the mass ratio of propyl acrylate grafted bentonite, ammonium persulfate is 1:0.1), reacted for 3h, filtered and dried to obtain modified bentonite;

[0076] S5, according to the above mass fraction, water, silicone modified acrylic emulsion, hydroxyethyl cellulose is blended, mechanical stirring at 200 r / min for 5 min until completely dissolved, then add 0.6 parts of P30, 0.4 parts of LCN070, 0.3 parts of DF-1390, 2.5 parts of alcohol ester twelve and 0.1 parts of AMP-95, the stirring speed is increased to 500 r / min and stirred for 4 min, then the stirring speed is kept at 500 r / min, and the aerogel dispersion slurry, expanded perlite, hollow glass microsphere, wood fiber and modified bentonite are added in turn, the stirring speed is increased to 800 r / min and stirred for 20 min, then the stirring speed is reduced to 600 r / min, 0.4 parts of RM-8W, 0.3 parts of 2410AC, 1.3 parts of PEG 300 and 0.1 parts of MBS5050 are added in turn, and the stirring is continued for 8 min until the dispersion is uniform, to obtain a high adhesive, high water resistant, light weight, environmentally friendly sound insulation coating.

[0077] Figure 1 The preparation principle of the coating of example 1 is shown.

[0078] Example 2

[0079] A high adhesive, high water resistant, light weight, environmentally friendly sound insulation coating, comprising the following components in mass fraction:

[0080]

[0081] The preparation method of the high adhesive, high water resistant, light weight, environmentally friendly sound insulation coating comprises the following steps:

[0082] S1, 3.2 parts of dodecyl benzene sulfonic acid is dissolved in 50 parts of deionized water, then transferred to a 250 ml four-necked flask with a mechanical stirrer and a condenser, heated to 80℃ under continuous stirring, 35 parts of octamethylcyclotetrasiloxane and 5 parts of γ-methacryloxypropyltrimethoxysilane are added dropwise within 1 hour, reacted for 12 hours, cooled to 40℃, the pH value is adjusted to 7-8 with 0.5 parts of AMP-95, heated to 80℃, 1.2 parts of methyl methacrylate and 0.3 parts of ammonium persulfate are added dropwise within 2 hours, incubated for 4 hours, cooled to room temperature, the pH value is adjusted with 0.5 parts of AMP-95, filtered, and discharged, to obtain the silicone modified acrylic emulsion;

[0083] S2, 64 parts of water is added to a stirring container, 3 parts of P30, 2 parts of LCN070 and 0.5 parts of AMP-95 are slowly added under low speed stirring, and stirred until uniformly dispersed and fully dissolved in water; 30 parts of KNF-W20-H is slowly added, the stirring speed is increased to 1200-1500 r / min, and high speed stirring is carried out for 20 min to ensure that the KNF-W20-H is fully dispersed; finally, 3 parts of 2410AC is added, and medium speed stirring is carried out until uniformly dispersed, to obtain the aerogel dispersion slurry;

[0084] S3, bentonite, potassium persulfate, propyl acrylate and solvent ethanol are mixed (the mass ratio of bentonite, potassium persulfate, propyl acrylate, solvent is 1:1.5:50:70) to obtain a suspension solution, then deionized water with the same mass as the suspension solution is added, heated to 200°C and stirred for 0.5h, the suspension solution is uniformly dispersed, and then heated and reacted for 5h, filtered, and dried in an oven at 90°C for 3h to obtain propyl acrylate grafted bentonite; hollow glass microspheres and kh570 are added to an ethanol aqueous solution with a mass fraction of 90% (the mass ratio of hollow glass microspheres, kh570, ethanol is 1:0.2:20), ultrasonic dispersed at 60°C for 1h, then suction filtered, dried, ground, and sieved to obtain silane coupling agent grafted hollow glass microspheres; wood fibers, anhydrous pyridine, and 2 molar parts of tung oil acid chloride are blended, a catalyst N,N-dimethylaminopyridine is added (the mass ratio of wood fibers, anhydrous pyridine, N,N-dimethylaminopyridine is 1:30:0.05), heated to 50°C and reacted for 6h, then 50% ethanol aqueous solution is added (the mass ratio of wood fibers, ethanol is 1:20) and stirred for 30min, suction filtered, washed with a small amount of ethanol three times, then washed once with acetone, extracted with acetone in a Soxhlet extractor for 16h, and dried in an oven at 60°C for 24h to obtain tung oil acid grafted wood fibers;

[0085] S4, under a nitrogen environment, sodium ethylenediamine sulfonate, propyl acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, and tung oil acid grafted wood fibers are added to deionized water (the mass ratio of sodium ethylenediamine sulfonate, propyl acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, tung oil acid grafted wood fibers, deionized water is 0.2:1:1:1:10) and stirred for 15min, heated to 80°C, and ammonium persulfate is added dropwise (the mass ratio of propyl acrylate grafted bentonite, ammonium persulfate is 1:0.1), reacted for 3h, filtered and dried to obtain modified bentonite;

[0086] S5. According to the above-mentioned parts by mass, water, silicone-modified acrylic emulsion and hydroxyethyl cellulose were blended and mechanically stirred at a speed of 500 r / min for 10 minutes until completely dissolved. Then, 1.0 parts of P30, 0.2 parts of LCN070, 0.5 parts of DF-1390, 2.1 parts of alcohol ester twelve and 0.2 parts of AMP-95 were added in sequence, the speed was increased to 800 r / min and stirring was continued for 4 minutes, and then aerogel dispersion slurry, expanded perlite, hollow glass microspheres, wood fiber and modified bentonite were added in sequence while maintaining the speed of 800 r / min. The speed was increased to 1000 r / min and stirred for 15 minutes. After reducing the speed to 800 r / min, 0.2 parts of RM-8W, 0.2 parts of 2410AC, 1.0 parts of PEG 300 and 0.3 parts of MBS5050 were added in sequence, and stirring was continued for 5 minutes until uniformly dispersed to obtain a lightweight, environmentally friendly sound insulation coating with high adhesion and high water resistance.

[0087] Example 3

[0088] A lightweight, environmentally friendly sound-insulating coating with high adhesion and high water resistance, comprising the following components in parts by weight:

[0089] 28 parts of silicone modified acrylic emulsion

[0090]

[0091] The preparation method of the lightweight environmentally friendly sound insulation coating with high adhesion and high water resistance comprises the following steps:

[0092] S1. Dissolve 3.2 parts of dodecylbenzenesulfonic acid in 50 parts of deionized water, then transfer to a 250 ml four-necked flask with a mechanical stirrer and a condenser, heat to 80° C. under continuous stirring, add 35 parts of octamethylcyclotetrasiloxane and 5 parts of γ-methacryloxypropylmethyltrioxysilane dropwise within 1 hour, react for 12 hours, cool to 40° C., adjust the pH to 7-8 with 0.5 parts of AMP-95, heat to 80° C., add 1.2 parts of methyl methacrylate and 0.3 parts of ammonium persulfate dropwise within 2 hours, keep warm for 4 hours, cool to room temperature, adjust the pH with 0.5 parts of AMP-95, filter, and discharge to obtain the organosilicon-modified acrylic emulsion;

[0093] S2. Add 64 parts of water to a stirring container, slowly add 3 parts of P30, 2 parts of LCN070 and 0.5 parts of AMP-95 under low-speed stirring, and stir until they are evenly dispersed and fully dissolved in water; slowly add 30 parts of KNF-W20-H, increase the speed to 1200-1500 rpm, and stir at high speed for 20 minutes to ensure that KNF-W20-H is fully dispersed; finally, add 3 parts of 2410AC and stir at medium speed until they are evenly dispersed to obtain the aerogel dispersion slurry;

[0094] S3, bentonite, potassium persulfate, propyl acrylate and solvent ethanol are mixed (the mass ratio of bentonite, potassium persulfate, propyl acrylate, solvent is 1:1.5:50:70) to obtain a suspension solution, then deionized water with the same mass as the suspension solution is added, heated to 200°C and stirred for 0.5h, the suspension solution is uniformly dispersed, and then heated and reacted for 5h, filtered, and dried in an oven at 90°C for 3h to obtain propyl acrylate grafted bentonite; hollow glass microspheres and kh570 are added to an ethanol aqueous solution with a mass fraction of 90% (the mass ratio of hollow glass microspheres, kh570, ethanol is 1:0.2:20), ultrasonic dispersion is carried out at 60°C for 1h, then suction filtration, drying, grinding and sieving are carried out to obtain silane coupling agent grafted hollow glass microspheres; wood fibers, anhydrous pyridine, and 2 molar parts of tung oil acid chloride are blended, a catalyst N,N-dimethylaminopyridine (the mass ratio of wood fibers, anhydrous pyridine, N,N-dimethylaminopyridine is 1:30:0.05) is added, heated to 50°C and reacted for 6h, then 50% ethanol aqueous solution (the mass ratio of wood fibers, ethanol is 1:20) is added and stirred for 30min, suction filtration is carried out, washed with a small amount of ethanol three times, then washed once with acetone, extracted with acetone in a Soxhlet extractor for 16h, and dried in an oven at 60°C for 24h to obtain tung oil acid grafted wood fibers;

[0095] S4, under a nitrogen environment, sodium ethylenediamine sulfonate, propyl acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, and tung oil acid grafted wood fibers are added to deionized water (the mass ratio of sodium ethylenediamine sulfonate, propyl acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, tung oil acid grafted wood fibers, deionized water is 0.2:1:1:1:10) and stirred for 15min, heated to 80°C, and then ammonium persulfate is added dropwise (the mass ratio of propyl acrylate grafted bentonite, ammonium persulfate is 1:0.1), reacted for 3h, filtered and dried to obtain modified bentonite;

[0096] S5, according to the above quality fraction, water, silicone modified acrylic emulsion, hydroxyethyl cellulose is blended, mechanical stirring at 350 / min speed for 7.5 min until completely dissolved, then 0.8 parts of P30, 0.3 parts of LCN070, 0.4 parts of DF-1390, 2.3 parts of alcohol ester twelve and 0.15 parts of AMP-95 are added in turn, the stirring speed is increased to 650 r / min and stirring is continued for 5 min, then the stirring speed is kept at 650 r / min, and aerogel dispersion slurry, expanded perlite, hollow glass microsphere, wood fiber, modified bentonite are added in turn, the stirring speed is increased to 900 r / min and stirring is continued for 17.5 min, after the stirring speed is reduced to 700 r / min, 0.3 parts of RM-8W, 0.25 parts of 2410AC, 1.15 parts of PEG 300 and 0.2 parts of MBS5050 are added in turn, and stirring is continued for 6.5 min until uniform dispersion, to obtain a lightweight environment-friendly sound insulation coating with high adhesion and high water resistance.

[0097] Comparative Example 1

[0098] Comparative Example 1 and Example 1 differ in that the same mass of commonly used silicone-acrylate emulsion (brand BadeFu 996AD) is used to replace the silicone modified acrylic emulsion, step S1 is deleted, and the rest of the components, mass fraction and preparation method are unchanged.

[0099] Comparative Example 2

[0100] Comparative Example 2 and Example 1 differ in that step S2 is deleted, and the same mass of KNF-W20-H is used to replace the aerogel dispersion slurry, and the rest of the components, mass fraction and preparation method are unchanged.

[0101] Comparative Example 3

[0102] Comparative Example 3 and Example 1 differ in that the part of preparing tung oil grafted wood fiber in step S3 is deleted, and tung oil grafted wood fiber is not added in step S4, and the rest of the components, mass fraction and preparation method are unchanged.

[0103] Comparative Example 4

[0104] Comparative Example 4 is a prior art sound insulation coating product, and its composition is as follows: styrene-acrylic emulsion 11 parts, hydroxyethyl cellulose 0.6 parts, film forming aid 0.8 parts, defoamer 0.2 parts, bactericide 0.5 parts, pH regulator 0.1 parts, ethylene glycol 0.8 parts, 70 mesh snow white 44 parts, rubber 6 parts, mineral fiber cotton 6 parts, thickening agent 0.5 parts, and water 30 parts.

[0105] Test Example 1

[0106] Coating application performance, drying time (surface dry), initial drying anti-cracking (3mm thick), water resistance and heat storage (15d), adhesion strength, sound insulation, VOC content test were carried out on examples 1-3, comparative examples 1-4.

[0107] Test method

[0108] Coating application performance, drying time (surface dry), initial drying anti-cracking (3mm thick), water resistance and heat storage (15d) were detected according to the standard of JG / T24-2018, wherein the calculation method of 5mm coating weight per square meter was that the weight of the coating was calculated according to the thickness of the coating combined with the density of the coating; the adhesion strength was tested according to the results of no treatment and immersion treatment in 7.6 of GB / T 23445-2009; the test method of sound insulation performance was that the sound insulation coating product was sprayed on the reinforced concrete floor with the normalized impact sound pressure level of Ln,w=78dB, sprayed 2 times, the thickness was 5mm, and the surface layer had no decorative layer, then the test was carried out according to GB / T 50121-2005, GB / T 19889.8-2006; the VOC content was detected according to the standard of GB 18582-2020.

[0109] Test results

[0110] Table 1 shows the test results of examples 1-3, comparative examples 1-4

[0111] Table 1 test results of examples 1-3, comparative examples 1-4

[0112]

[0113]

[0114] As can be seen from Table 1, Examples 1-3 have good bonding, water resistance, sound insulation and other properties, and are lightweight and environmentally friendly, significantly better than Comparative Examples 1-4. Comparative Example 1 replaces the silicone-modified acrylic emulsion with a commonly used silicone-acrylic emulsion (brand Bader 996AD) on the market of equal mass, which reduces the silicon content in the emulsion, resulting in reduced water resistance, bonding, and crack resistance. Comparative Example 2 deletes step S2 and replaces the aerogel dispersion slurry with an equal mass of KNF-W20-H, which reduces the dispersibility of the silica aerogel, resulting in reduced sound insulation performance, poor construction performance, and an increase in the weight of a 5mm thick coating sprayed per square meter. Comparative Example 3 replaces the modified bentonite with a modified bentonite free of eleostearic acid-grafted wood fiber of equal mass, which reduces the compatibility of the components, resulting in extended drying time, reduced crack resistance, and reduced sound insulation. Comparative Example 4 uses a prior art sound insulation coating product, which does not contain the modified bentonite, silicone-modified acrylic emulsion and other components of the examples, resulting in various performances being lower than those of the examples, and having a higher VOC and less than ideal environmental performance.

[0115] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0116] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A lightweight, environmentally friendly sound insulation coating with high adhesion and high water resistance, characterized in that: The lightweight, environmentally friendly sound-insulating coating with high adhesion and high water resistance comprises the following components in parts by mass: 25-31 parts of silicone modified acrylic emulsion 15-20 parts hollow glass microspheres 7-15 parts of aerogel dispersion slurry 8-10 parts expanded perlite 0.4-1 part modified bentonite 0.5-2.5 parts of wood fiber 0.1-0.2 parts of hydroxyethyl cellulose 4.8-6.9 parts of additives 20-45 parts water; The modified bentonite is obtained by reacting acrylate grafted bentonite, silane coupling agent grafted hollow glass microspheres, and eleostearic acid grafted wood fiber; The organosilicon-modified acrylic emulsion is obtained by reacting organosiloxane, organosilicon coupling agent and acrylate.

2. The lightweight, environmentally friendly sound-insulating coating with high adhesion and high water resistance according to claim 1, characterized in that: The particle size of the expanded perlite is 2-4 mm.

3. The lightweight, environmentally friendly sound-insulating coating with high adhesion and high water resistance according to claim 1, characterized in that: The particle size of the hollow glass microspheres is 50-150 μm.

4. The lightweight, environmentally friendly sound-insulating coating with high adhesion and high water resistance according to claim 1, characterized in that: The auxiliary agent is selected from one or more of a dispersant, a wetting agent, a mineral oil defoamer, a film-forming aid, a pH regulator, a polyurethane thickener, a silicone defoamer, and a preservative.

5. The method for preparing the lightweight, environmentally friendly, sound-insulating coating with high adhesion and high water resistance according to any one of claims 1 to 4, characterized in that: The preparation method of the lightweight, environmentally friendly sound-insulating coating with high adhesion and high water resistance comprises the following steps: S1. Add an emulsifier into a container, dropwise add an organosiloxane and an organosilicon coupling agent, heat at 70-90°C for reaction, and then dropwise add an acrylate to continue the reaction to obtain an organosilicon-modified acrylic emulsion; S2, blending and stirring a dispersant, a wetting agent, a pH regulator, and silica aerogel powder, adding a defoamer and stirring to obtain an aerogel dispersion slurry; S3, blending bentonite and acrylate, heating at 190-210° C. to react, to obtain acrylate-grafted bentonite; blending hollow glass microspheres and silane coupling agent, heating at 55-65° C. to react, to obtain silane coupling agent-grafted hollow glass microspheres; blending wood fiber and eleostearic acid, heating at 50-100° C. to react, to obtain eleostearic acid-grafted wood fiber; S4. Under an inert atmosphere, blending acrylate-grafted bentonite, silane coupling agent-grafted hollow glass microspheres, and eleostearic acid-grafted wood fiber, and heating them to react to obtain modified bentonite; S5. Blend the organosilicon-modified acrylic emulsion, the aerogel dispersion slurry, the modified bentonite and other components, and stir to obtain a lightweight, environmentally friendly sound insulation coating with high adhesion and high water resistance.

6. The method for preparing the lightweight, environmentally friendly, sound-insulating coating with high adhesion and high water resistance according to claim 5, characterized in that: In step S1, the mass ratio of the organosiloxane, the organosilicon coupling agent, and the acrylate is (20-40):(2-7):(1-5).

7. The method for preparing the lightweight, environmentally friendly, sound-insulating coating with high adhesion and high water resistance according to claim 5, characterized in that: In step S2, the mass ratio of the dispersant, wetting agent, pH regulator, silica aerogel powder and defoaming agent is 3:2:0.5:(30-40):(1-5).

8. The method for preparing the lightweight, environmentally friendly, sound-insulating coating with high adhesion and high water resistance according to claim 5, characterized in that: In step S3, the mass ratio of the bentonite to the acrylate is 1:(45-55); the mass ratio of the hollow glass microspheres to the silane coupling agent is 1:(0.2-0.4); and the amount of eleostearic acid used is 1-5 times the amount of the active hydroxyl substance in the wood fiber.

9. The method for preparing the lightweight, environmentally friendly, sound-insulating coating with high adhesion and high water resistance according to claim 5, characterized in that: In step S4, the mass ratio of the acrylate grafted bentonite, the silane coupling agent grafted hollow glass microspheres, and the eleostearic acid grafted wood fiber is (1-3):(1-3):(1-3).

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